Processing kodak motion picture films, module 3 analytical procedures

CALCULATIONS
For Sodium metabisulfite, g/L;
g/L Na 2 S 2 O 5 = [4.753 ((mLs Blank x 1.25) - (mLs Na 2 S 2 O 3 )(NNa 2 S 2 O 3 )
- [0.216 (Kodak ECP-2 persulfate bleach accelerator, PBA-1, g/L
where:
mLs Blank = volume of sodium thiosulfate in milliliters
required to reach the equivalence point
without the addition of sample
mL Na2S2O3 = volume of sodium thiosulfate in milliliters
required to reach the equivalence point
with sample
NNa2S2O3 = normality of the sodium thiosulfate in
milliequivalents per milliliter (meq/mL)
BA-1, g/L = grams per liter of PBA-1 in Accelerator
tank as measured by method
ECP-0027-01
4.753 = equivalent weight of sodium metabisulfite
divided by the sample size
0.216 = equivalent weight of PBA-1 divided by
sample size
If mL 0.1008 N Na2S2O3 = 37.85 mLs
mLs Blank = 39.87 mLs
PBA-1 = 3.45 g/L
g/L Na2S2O5 = [4.753 ((39.87 x 1.25) - 37.85) (0.1008] - 0.216 (3.45)
=5.740-0.745
g/L Na2S2O5 =4.995
Figure 2 S-shaped Curve
−100 −200 −300 −400
+ MiliVolts
−
F002_1125GC
6 Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03
MiliLiters